八年級英語語法
18. a lot of vegetables help you to keep in good health . keep in good health = keep healthy = stay healthy
19. you must try to eat less meat . → try to do sth. 表示“ 盡力做某事 ” , 不包含是否成功的意思 / less是little的比較級
20. that sounds interesting. 這是“主語+系動詞+表語”結構的簡單句。sound（聽起來），look（看起來），smell（聞起來），taste（嘗起來），feel（覺得），seem（好象），grow（變得） , get（變得）等詞在英語中可用作系動詞，后跟形容詞作表語。如：
it tastes good. 這味道好。
the music sounds very sweet. 這音樂聽起來很入耳。
the smoke grew heavier and heavier. 煙霧變得越來越濃了。
unit two
1. what’s the matter ? what’s the mater with you ? with為介詞，后跟名詞、代詞或動名詞。人稱代詞必須用它的賓格。
i have a cold / have a sore back / have a stomachache
2. you should lie down and rest / drink hot tea with honey / see a dentist / see a doctor .
3. i’m not felling well . 這里well表示身體狀況，不能用good代替
4. when did it start ? about two days ago .
5. that’s too bad .
6. i hope you fell better soon . 這里better是well的比較級
7. traditional chinese doctors believe we need a balance of yin and yang to be healthy . 這里 to be healthy是動詞不定式短語，作目的狀語
8. maybe you have too much yin . too much后跟不可數名詞，而too many后跟可數名詞復數
9. it’s easy to have a healthy lifestyle ,and it’s important to eat a balanced diet . → it’s easy to do sth . 做某事容易 / it’s important to do sth . 做某事重要
10. everyone gets tired sometimes . 這里get連系動詞，tired是形容詞作表語，屬系表結構
11. a sore throat can give you a fever . → give sb. sth . = give sth. to sb. 把某物給某人
12. don’t get stressed out. it’s not healthy . 在這里get是連系動詞，stressed out是表語
13. i have a toothache . i need to see a dentist . → need意思為 “需要” ，作實義動詞時，后跟動詞不定式，否定式為don’t /doesn’t / didn’t need (to do sth.) ；作情態動詞時，只能用于否定句或疑問句中，否定式為needn’t(do sth.) ，除有過去式外，沒有其它的形態變化
14. eat a balanced diet to stay healthy . to stay healthy是動詞不定式短語，作目的狀語
15. i’m not feeling very well at the moment . at the moment = now
unit three
1. what are you doing for vacation ? i’m babysitting my sister .
where are you going for vacation ? italy .
這是現在進行時的一種比較特殊的用法，用來表示按計劃或安排要做的事情，現在還沒有去做。
2. who are you going with ? i’m going with my parents . with my parents是介詞短語，在這里作伴隨狀語，起修飾謂語動詞are going的作用
3. when are you going ? i’m going on monday .